May 24 – 28, 2021
America/Vancouver timezone

The Event Timing Finder for the Central Drift Chamber Level-1 Trigger at the Belle II experiment

May 27, 2021, 5:00 AM
Poster Readout: Trigger and DAQ Posters: Trigger and DAQ


Yuki Sue (Nagoya University)


The Level-1 trigger system of the Belle II experiment is designed to select physics events of interest with almost 100% efficiency. In terms of event timing decision, the level-1 trigger is required to have an accuracy of less than 10 ns. The Central Drift Chamber (CDC) level-1 trigger provides the event timing information as one of the level-1 timing sources. We developed the new algorithm to measure the event timing with an accuracy of about 10 ns based on the CDC hit timing. Two-dimensional charged track reconstruction by Hough transformation was utilized to reduce high background hits. We used a new-developed general-purpose FPGA board (Universal Trigger board 4) for this module for the first time. We will report the performance of the new algorithm using e+e- collision data collected in 2020.

TIPP2020 abstract resubmission? No, this is an entirely new submission.

Primary authors

Yuki Sue (Nagoya University) Bae Hanwook Toru Iijima (Nagoya University) Yoshihito Iwasaki (High energy accelerator organization) Taichiro Koga (High energy accelerator organization) Yun-Tsung Lai (IPMU) Hideyuki Nakazawa (National Taiwan University) Kai Lukas Unger (Karlsruhe Institute of Technology (KIT))

Presentation materials